Fix MYPY type ignore comments for dynamic imports.

Change type: ignore[import-not-found] to type: ignore[import] to match
MYPY's expected error code for these dynamic module imports.

Author: MartinPavella

kernels/test/gen_supported_features_test.py

@@ -8,7 +8,7 @@
 import unittest
 
 import yaml
-from executorch.kernels.test.gen_supported_features import (  # type: ignore[import-not-found]
+from executorch.kernels.test.gen_supported_features import (  # type: ignore[import]
     generate_definition,
     generate_header,
 )

profiler/profiler_results_cli.py

@@ -7,7 +7,7 @@
 import argparse
 import sys
 
-from executorch.profiler.parse_profiler_results import (  # type: ignore[import-not-found]
+from executorch.profiler.parse_profiler_results import (  # type: ignore[import]
     deserialize_profile_results,
     mem_profile_table,
     profile_aggregate_framework_tax,

test/models/generate_linear_out_bundled_program.py

@@ -27,9 +27,7 @@
 from executorch.exir.passes import MemoryPlanningPass, ToOutVarPass
 from executorch.exir.print_program import pretty_print
 
-from executorch.test.models.linear_model import (  # type: ignore[import-not-found]
-    LinearModel,
-)
+from executorch.test.models.linear_model import LinearModel  # type: ignore[import]
 from torch.export import export